Description

DRIVER LED WHITE H/EFFICIENCY SMD
The MAX8901A/MAX8901B step-up converters drive from two to six series-connected white LEDs (WLEDs) with constant current to provide uniform WLED intensity for LCD backlighting in cell phones, PDAs, and other handheld devices. The MAX8901_ operate at a fixed 750kHz (typ) switching frequency, allowing for tiny exter- nal components, and are optimized for the highest possi- ble efficiency over the full 1-cell Li+/Li-Poly battery range. These converters use a single input (ON) to enable the IC and to control WLED intensity. The MAX8901A requires a direct PWM input to regulate WLED intensity with the WLED current proportional to the PWM duty cycle. The MAX8901B uses single-wire, serial-pulse dimming that reduces the WLED intensity in 32 linear steps. Full-scale WLED current for serial-pulse dimming is 24.75mA (MAX8901B, 0.75mA/step). The MAX8901_ feature an internal soft-start to eliminate inrush currents during startup, input overvoltage protection, WLED overvoltage protection, and a shut- down mode with 0.01µA (typ) shutdown current. No WLED current is present in shutdown provided the WLED forward voltage is greater than the input supply voltage. Additional features include undervoltage lock- out (UVLO) and thermal shutdown. The MAX8901_ are available in tiny 8-pin, 2mm x 2mm TDFN-EP packages (0.8mm max height).

Specifications

Device Topology:

Boost (Step Up)

No. of Outputs:

1Outputs

Output Current:

24.75mA

Output Voltage:

25V

Driver Case Style:

TDFN

No. of Pins:

8Pins

Input Voltage Min:

2.6V

Input Voltage Max:

5.5V

Switching Frequency:

750kHz

Operating Temperature Min:

-40°C

Operating Temperature Max:

85°C

Product Range:

-

Automotive Qualification Standard:

-

MSL:

MSL 1 - Unlimited

SVHC:

No SVHC (15-Jan-2018)

Base Number:

8901

Device Type:

LED

Dimming Control Type:

PWM

Efficiency:

91%

Input Voltage:

2.6V to 5.5V

LED Driver Application:

Backlighting Cellular Phones

Operating Temperature Range:

-40°C to +85°C

Termination Type:

Surface Mount Device

Topology:

Boost (Step Up)

Alternate Descriptions

Avnet America

Highest Efficiency Supply 8-Pin TDFN EP T/R

Avnet Europe

Highest Efficiency Supply 8-Pin TDFN EP T/R

Avnet Asia

Highest Efficiency Supply 8-Pin TDFN EP T/R

Future Electronics

Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package